Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86

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From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86
Date	Sun, 17 May 2026 20:40:01 +0200
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Control: forcemerge #1136790 1136957

Hi,

On Sun, May 17, 2026 at 05:19:44PM +0200, Tophetei wrote:
> Source: linux
> Version: 6.12.88-1
> Severity: important
> Tags: upstream
> X-Debbugs-Cc: dontspam884@gmail.com
> 
> Dear Maintainer,
> 
> MediaTek MT7922 Bluetooth (USB 0489:e0d8) stopped working since kernel
> 6.12.86+deb13. The last working kernel is 6.12.63+deb13.
> 
> Hardware:
>   Bus 003 Device 002: ID 0489:e0d8 Foxconn / Hon Hai Bluetooth 5.2 Adapter
>   [MediaTek MT7922]
> 
> Kernel error (dmesg):
>   Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time: 20241106163512
>   Bluetooth: hci0: Failed to send wmt func ctrl (-22)
>   Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is
>   advertised, but not supported.
> 
> bluetoothctl: "No default controller available"
> btmgmt info: "Index list with 0 items"
> 
> Bisect:
>   Working:  linux-image-6.12.63+deb13-amd64 (6.12.63-1)
>   Broken:   linux-image-6.12.86+deb13-amd64 (6.12.86-1)
>   Broken:   linux-image-6.12.88+deb13-amd64 (6.12.88-1)
>   Broken:   linux-image-7.1-amd64 (7.1~rc3-1~exp1)
> 
> Tested firmware: firmware-mediatek 20250410-2 and upstream
> BT_RAM_CODE_MT7922_1_1_hdr.bin (Build Time: 20260224103448) — same result.
> 
> System: Debian 13 (trixie), amd64

Please check against open bug reports for issues, but I acknowledge
that in the amount of src:linux bugs this might be hard to find. In
any case this is #1136790 and friends, so will merge it.

Regards,
Salvatore

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Thread

Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86 Tophetei <dontspam884@gmail.com> - 2026-05-17 17:30 +0200
  Processed: Re: Bug#1136957: bluetooth: MediaTek MT7922 regression  - Failed to send wmt func ctrl (-22) since 6.12.86 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-17 20:40 +0200
  Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86 Salvatore Bonaccorso <carnil@debian.org> - 2026-05-17 20:40 +0200
  Bug#1136957: bluetooth: MediaTek MT7922 regression - Failed to send wmt func ctrl (-22) since 6.12.86 Ethan Rushforth <t2712142@gmail.com> - 2026-05-18 07:00 +0200
  Bug#1136957: marked as done (bluetooth: MediaTek MT7922  regression - Failed to send wmt func ctrl (-22) since 6.12.86) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-22 08:30 +0200
  Bug#1136957: marked as done (bluetooth: MediaTek MT7922  regression - Failed to send wmt func ctrl (-22) since 6.12.86) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-22 22:40 +0200

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